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1. 淇敼瀛楃涓茬殑鍐呭锛?/li>

String str = "Hello";
str = str.replace("H", "J");
System.out.println(str);  // 杈撳嚭 "Jello"

2. 淇敼鏁扮粍涓殑鍏冪礌锛?/li>

int[] nums = {1, 2, 3};
nums[0] = 4;
System.out.println(nums[0]);  // 杈撳嚭 4

3. 淇敼闆嗗悎涓殑鍏冪礌锛?/li>

List<String> list = new ArrayList<>();
list.add("apple");
list.add("banana");
list.set(1, "orange");
System.out.println(list);  // 杈撳嚭 ["apple", "orange"]

4. 淇敼鑷畾涔夊璞＄殑灞炴€э細

class Person {
private String name;
public Person(String name) {
this.name = name;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
Person person = new Person("John");
person.setName("Alice");
System.out.println(person.getName());  // 杈撳嚭 "Alice"

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