test
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src/main/java/com/zeekling/arg/ArgsTest.java
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src/main/java/com/zeekling/arg/ArgsTest.java
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package com.zeekling.arg;
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public class ArgsTest {
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public static void main(String[] args) {
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System.out.println(args[0]);
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}
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}
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src/main/java/com/zeekling/bit/BitTest.java
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src/main/java/com/zeekling/bit/BitTest.java
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package com.zeekling.bit;
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public class BitTest {
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public static void main(String[] args) {
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System.out.println(14^3);
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System.out.println(17^5);
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}
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}
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src/main/java/com/zeekling/integer/SplitNum.java
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src/main/java/com/zeekling/integer/SplitNum.java
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package com.zeekling.integer;
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/**
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* 考察方法进栈与出栈的顺序。先进后出
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* 有个知识点,方法在出栈的时候,执行的是return语句。因为出栈就意味着方法结束并消费,如果没有return语句,那么方法出栈的时候什么都不执行,就直接销毁。
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* 1.执行split(12)时,执行代码System.out.print(split(number / 2))
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* split(12/2)进栈,此时number=6;
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* 2.执行split(6)时,执行代码System.out.print(split(number / 2))
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* split(6/2)进栈,此时number=3;
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* 3.执行split(3)时,
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* 1
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* 2
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* 3
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* 第1行 if (number % 2 != 0)
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* 第2行 System.out.print(split((number + 1) / 2));
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* 第3行 System.out.print(split(number / 2));
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* 按照顺序执行
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* 先执行第2行
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* 首先split((3+1)/2)进栈,此时number=2,
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* 再执行split(2),那么split(2/2)进栈,此时number=1, 最后return 1,
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* 注意此时第2行代码还没有结束
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* 此时
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* split(2/2)出栈,输出1;
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* split((3+1)/2)出栈,输出2;
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* 第二行代码结束,再执行第三行,此时number=3,执行System.out.print(split(number / 2))
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* split(3/2)进栈,number=1,return,那么就需要出栈了
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* split(3/2)出栈,输出1
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* split(6/2)出栈,输出3
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* split(12/2)出栈,输出6;
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* 最终结果12136;
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*
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* split(number)方法,最终返回的是number这个值,所以split(n)出栈的输出结果就是n
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*
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* 整理:
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* split(12/2)进栈
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* split(6/2)进栈
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*
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* split((3+1)/2)进栈
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* split(2/2)进栈
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* split(2/2)出栈,输出1
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* split((3+1)/2)出栈,输出2
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*
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* split(2/2)进栈
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* split(2/2)出栈,输出1
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*
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* split(6/2)出栈,输出3
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* split(12/2)出栈,输出6
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*/
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public class SplitNum {
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public static void main(String[] args) {
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split(12);
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}
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public static int split(int number) {
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if (number > 1) {
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if (number % 2 != 0) System.out.print(split((number + 1) / 2));
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System.out.print(split(number / 2));
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}
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return number;
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}
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}
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src/main/java/com/zeekling/stat/StaticTest.java
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src/main/java/com/zeekling/stat/StaticTest.java
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package com.zeekling.stat;
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class Test {
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public static void hello() {
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System.out.println("hello");
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}
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}
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public class StaticTest {
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public static void main(String[] args) {
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Test test=null;
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test.hello();
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}
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}
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