断点调试

1. 断点调试

F7(跳入) F8(跳过) shift+F8(跳出) F9(resume,执行到下一个断点)

F7： 跳入方法内

F8: 逐行执行代码.

shift+F8: 跳出方法

下断点在行号单击鼠标左键，再次单击取消

package com.stulzl.debug_;///看变量变化  328public class Debug01 {    public static void main(String[] args) {        ///演示逐行执行        int sum=0;        for (int i = 0; i < 5; i++) {            sum+=i;            System.out.println("i="+i);            System.out.println("sum="+sum);        }        System.out.println("退出for..";    }}

代码执行中例图

package com.stulzl.debug_;public class Debug02 {    public static void main(String[] args) {        int[] arr = {1, 10, -1};        for (int i = 0; i <= arr.length; i++) {            System.out.println(arr[i]);        }        System.out.println("退出 for");    }}

因为i <= arr.length得了3

进入原码配置

package com.stulzl.debug_;import java.util.Arrays;///如何追源代码  330public class Debug03 {    public static void main(String[] args) {        int[] arr = {1, -1, 10, -20 , 100};        让我们看看 Arrays.sort 底层实现方法.->Debug        Arrays.sort(arr);////按f7跳法执行此行        for (int i = 0; i < arr.length; i++) {            System.out.print(arr[i] + "\t");        }    }}

package com.stulzl.debug_;import java.util.Arrays;public class Debug04 {    public static void main(String[] args) {        int[] arr = {1, -1, 10, -20 , 100};        让我们看看 Arrays.sort 底层实现方法.->Debug        Arrays.sort(arr);        for (int i = 0; i < arr.length; i++) {            System.out.print(arr[i] + "\t");        }        System.out.println(hello100);        System.out.println(hello200);        System.out.println(hello300);        System.out.println(hello400);        System.out.println(hello500);        System.out.println(hello600);        System.out.println(hello700);    }}

package com.stulzl.debug_exercise;public class Exercisedebugercise01 {    public static void main(String[] args) {        /////创建对象的流程信息        /1.加载Person信息        //2.初始化(2.1默认初始化，2.2显示初始化，2.3构造器初始化)        //3.返回对象的地址        Person jack = new Person("jack",20);        System.out.println(jack);    }}class Person{    private  String name;    private int age;        public Person(String name, int age) {        this.name = name;        this.age = age;    }    //重写tostirng    @Override    public String toString() {        return "Person{" +                "name='" + name + '\'' +                ", age=" + age +                '}';    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }}